A series containing ten aryl 3-(substituted phenyl) bicyclo [2.2.1] heptene-2-yl-methanone derivatives including 3- (substituted phenyl) bicyclo [2.2.1]hepten-2-yl-(pyren-1-yl)- methanones have been synthesized by aqueous phase fly-ash catalyzed [4+2] Diels-Alder cyclo addition reaction of cyclopentadiene and aryl chalcones. The yields of the methanones are more than 60%. The synthesized methanones are characterized by their physical constants and spectral data. The insect antifeedant activities of synthesized methanones have been studied using Dethler’s leaf-discs bioassay method.